Fear is an effective motivator but it isn't necessarily healthy as it can lead to things like anxiety which can cause detrimental physiological effects.

Agreed.

I'd say fear of disappointing your teammates is excellent for pushing you pass your threshold during the toughest practices.

Fear of death is extremely effective in helping you get into that "carpe diem" mentaty. But it's optimal to accept your inevitable cadaver sitatuion.

Fear of the harmfull effects of ciggies are great to prevent non smokers.

Fear of what situations can arise from the drunk driving videos are good for preventing (tho pretty ineffective once you've got your mind put.

But if it's aching and it drains your energy into anxiousness all the f*kkin time, its stupid.

Howeva, sh!t ike Doomsday-calibre paranoia, or being scared of what others think of u, or living in a rabbitesque mode one ear tilted sidewayz and one eye constantly twitching lookin for predators out for you kinda degrades yo quality of life.. even if its intentions are... to SAve it.